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masya89 [10]
3 years ago
10

4x^2-7x=15 Solve by factoring and please please please explain or show the work

Mathematics
1 answer:
vodomira [7]3 years ago
8 0

Answer:

x=3 and x=-1.25

Step-by-step explanation:

4x^2-7x=15

subtract 15 from each side:

4x^2-7x-15=0

factor  (trying different numbers that the sum is 7 and the quotient is 15)

(2x-6 )(2x+2.5 )=0

2x-6=0 add 6 to each side

2x=6

x=3

2x+2.5=0   subtract 2.5 from each side

2x=-2.5

x=-1.25

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(HELP WITH THIS )Suppose ages of cars driven by company employees are normally distributed with a mean of 8 years and a
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Answer:

Let say 75% of  cars older than age  = Y  years

than 25 % cars of age less than Y Years

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A preschool teacher has 17.5 feet of yarn for her students to make necklaces to raise money for a local animal shelter each neck
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17.5x12=210
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37.5
17.5 is feet so you need to divide by 12 for inches which gets 210 and you need each necklace to be 14 inches so you need to divide 210 by 14 which is 15 each necklace costs 2.50 so you multiply 2.50x15
You get 37.5
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